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Mirrors > Home > MPE Home > Th. List > prssi | Structured version Visualization version Unicode version |
Description: A pair of elements of a class is a subset of the class. (Contributed by NM, 16-Jan-2015.) |
Ref | Expression |
---|---|
prssi |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | prssg 4140 |
. 2
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2 | 1 | ibi 249 |
1
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